P0806 — Clutch Position Sensor Circuit Range/Performance

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P0806 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the clutch position sensor for damage, corrosion, chafing or poor contact.
Subsystem check Compare the clutch position sensor live reading against a known-good reference (specification or a correlated sensor) under the conditions from the freeze frame.
Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P0806 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P0806 (parts and labor, USD, independent shop rates): Replace the faulty sensor or actuator: $150–$500; Control module repair: $300–$1,000; Repair wiring or connectors: $80–$250. Overall, fixing P0806 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What does OBD2 code P0806 mean?

Clutch Position Sensor Circuit Range/Performance (P0806): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by poor ground connection, faulty sensor or actuator of the affected circuit, control module driver fault.

What is the most common cause of P0806?

The most common causes are: poor ground connection, faulty sensor or actuator of the affected circuit, control module driver fault.

Is it safe to drive with P0806?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How do I diagnose P0806 myself?

Start with a scan: confirm P0806, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the clutch position sensor, and verify the suspect component against live data before buying parts.

Will P0806 clear itself?

Sometimes P0806 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

The clutch position sensor tells your engine computer exactly where your foot is pressing the clutch pedal. When everything works, the PCM (powertrain control module) uses this signal to manage gear shifts, enable starting, and sometimes control cruise systems. The sensor itself is a simple potentiometer or hall-effect device—nothing exotic, just a position reporter.

P0806 means the signal coming from that sensor is electrically sound (no short, no open circuit) but doesn't make sense for what the engine should be seeing at that moment. Think of it this way: the sensor is talking, and the wire isn't broken, but the message reads wrong. This triggers a "Range/Performance" code rather than a simple electrical failure. The underlying reason could be a sensor that has drifted out of calibration, a mechanical problem the sensor is accurately picking up, or a change in the system after a module update or battery disconnect.

The PCM won't throw P0806 on a single bad reading. It watches for the pattern to repeat under specific conditions before lighting up the check engine lamp. When you pull the code, the freeze frame data tells you the engine load, RPM, temperature, and vehicle speed at the exact moment the fault was detected. Use those numbers. Reproduce them when you test—that's your shortcut to finding the problem quickly.

Symptoms of P0806

The Check Engine Light is on and stays on after the fault condition repeats.

The clutch-related system works intermittently, or it stops working entirely.

Depending on which component is involved, the vehicle may enter limp mode—reduced power, limited gears, or disabled start capability.

Some drivers notice higher fuel consumption, especially if the PCM is making incorrect adjustments based on bad sensor data.

The engine may stall when coming to a stop if the PCM cannot determine when the clutch is fully depressed.

In rare cases, the starter may not engage when the clutch pedal is pressed, because the computer thinks the clutch is in the wrong position.

These symptoms overlap with many other issues. That is why scanner data and freeze frame information matter—they point you toward the clutch circuit instead of chasing random misfires.

Common Causes of P0806

Degraded or drifting clutch position sensor. This is the most frequent culprit. Sensors wear out, and their output voltage drifts away from specification over time.

Incorrect calibration after a module update or battery disconnect. The PCM sometimes loses its learned reference point when power is interrupted or a new program is installed.

Open or shorted wiring in the sensor circuit. A broken wire, pinched harness, or damaged insulation creates intermittent or total signal loss.

Poor ground connection at the sensor or PCM. Without a solid ground reference, the signal voltage swings unpredictably.

Corroded, loose, or damaged connector. Moisture intrusion and vibration loosen terminals over time.

Blown fuse feeding the circuit. A simple fuse failure cuts power to the sensor entirely.

Control module driver fault. The PCM itself may have an internal failure affecting how it reads or processes the sensor signal.

Mechanical fault that the sensor correctly reports. Sometimes the sensor is doing its job—the problem is a worn clutch, misaligned linkage, or damaged flywheel that the sensor catches.

How to Diagnose P0806

Connect an OBD2 scanner and confirm P0806 is stored. Save the freeze frame data immediately—that snapshot tells you engine load, RPM, coolant temperature, and vehicle speed at the moment the fault occurred. Write it down.

Before touching any wiring, check for related diagnostic trouble codes. P0805 (Clutch Position Sensor Circuit) and other transmission codes often appear alongside P0806 and can point you toward the real root cause. Also look up TSBs for your make and model—manufacturers publish service bulletins for known software glitches and sensor failures.

Visually inspect the wiring harness and connectors at the clutch position sensor. Look for broken insulation, rubbed-through wires, corrosion on terminals, and any sign that the connector is not fully seated. This step takes five minutes and catches the majority of electrical problems.

Compare the live sensor reading against the factory specification or a known-good correlated sensor under the exact conditions recorded in the freeze frame. If the voltage reads outside the expected range for those conditions, the sensor is likely faulty.

Measure reference voltage, ground integrity, and signal continuity at the sensor connector using a multimeter. Check for 5-volt reference supply, verify the ground circuit has minimal resistance, and confirm the signal wire is not open or shorted to ground or power.

Perform a wiggle test on the harness while monitoring live data. If the signal drops out when you move the wiring, you have found a broken wire inside the insulation—flexing it makes contact temporarily.

Clear the code, complete a full drive cycle that recreates the freeze frame conditions, and verify P0806 does not return. If the code comes back after driving, the fault is confirmed and you can proceed with repairs.

Repair Options and Costs

Begin with the cheapest and most common problems before replacing expensive components.

Replace the faulty clutch position sensor or actuator: $150–$500 for parts and labor at an independent shop.

Repair wiring, grounds, or connectors: $80–$250 depending on the extent of the damage and labor time.

Control module diagnosis and repair or replacement: $300–$1,000 depending on whether the PCM can be reprogrammed or must be replaced.

Total cost for fixing P0806 typically falls between $80 and $1,000 depending on which part is actually at fault. An accurate diagnosis before buying parts will save money—the worst-case scenario is rarely the first thing to check.

Can You Drive with P0806?

The severity rating for P0806 is short. In most cases the vehicle remains drivable, though you may experience reduced performance, disabled start capability, or a loss of certain transmission functions. If the car stalls, will not start, or triggers brake and steering warnings, treat it as urgent and stop driving. Otherwise, schedule repair soon but you are not stranded.